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\ ˈfas(t)-ˌtwich 
\
\Definition of fast-twitch
: of, relating to, or being muscle fiber that contracts quickly especially during brief high-intensity physical activity requiring strength — compare slow-twitch
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fast-twitch
adjective\ ˌfas(t)-ˌtwich \
\Medical Definition of fast-twitch
: of, relating to, or being muscle fiber that contracts quickly especially during brief high-intensity physical activity requiring strength — compare slow-twitch
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The first known use of fast-twitch was in 1970
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